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US ZIP Code Profile

ZIP Code 78231
San Antonio, Texas

ZIP code 78231 is in San Antonio, located in Bexar County, Texas, within the San Antonio-New Braunfels metro area. Its 2020 Census population was 8,993. The estimated median adjusted gross income per tax return is $71,875, and about 18% of filers report $200,000 or more.

2020 Population
8,993
Census ZCTA
County
Bexar
FIPS 48029
Median income (est.)
$71,875
IRS SOI 2022
Land Area
3.864 mi²
+ 0 mi² water

01Location & Geography

Authoritative geographic identifiers from the U.S. Census Bureau, ANSI, and FIPS standards.

Primary CitySan Antonio, TX
CountyBexar County (FIPS 48029)
StateTexas (FIPS 48)
Metro Area (MSA)San Antonio-New Braunfels, TX Metro Area (41700)
Census Region / DivisionSouth Region · West South Central Division
Coordinates29.57854, -98.5419
Land / Water Area3.864 mi² land · 0 mi² water

02Income & Economics

Distribution of the 4,440 individual tax returns filed in 78231 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
21.9%
$25K–$50K
17.1%
$50K–$75K
12.6%
$75K–$100K
9.0%
$100K–$200K
21.2%
$200K+
18.2%
The $200,000+ bracket accounts for 76% of 78231's total adjusted gross income, from 18% of returns — a concentration that drives the gap between the median ($71,875) and the average.
Estimated median = median adjusted gross income per tax return, interpolated from IRS SOI brackets. Differs from U.S. Census household income.

03Income Over Time

Year-over-year change in 78231's IRS income metrics, 2020–2022.

Median income (2021→2022)
$71,875
▲ 1.9%
Filers earning $200K+
18.2%
▲ 0.6 pt
Total filers
4,440
▲ 0.7%
GET /zipc/v2/zipcodes/78231/soi?year=… $65K 2020 $71K 2021 $72K 2022
Median = adjusted gross income per return, interpolated from IRS SOI brackets. Figures are nominal (not inflation-adjusted).

04Population Trend

Decennial U.S. Census population for the 78231 ZCTA.

2000
7,615
 
2010
7,906
▲ +3.8%
2020
8,993
▲ +13.7%

05Nearby ZIP Codes — Live Radius Search

Drag the slider to filter ZIP codes by distance from 78231. Powered by the same radius endpoint developers call from the API.

GET /zipc/v2/radius

ZIP codes within range of 78231

San Antonio and its immediate neighbors, sorted by distance.

3 mi
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Distance from 78231 to any ZIP

Enter a 5-digit ZIP to calculate the distance.

06USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number487980
City AliasesSan Antonio, Shavano Park

07Frequently Asked Questions

What county is ZIP code 78231 in?

ZIP code 78231 is in Bexar County, Texas (county FIPS code 48029).

What city is ZIP code 78231?

The primary USPS city for 78231 is San Antonio, TX.

What metro area (MSA) is 78231 in?

78231 is part of the San Antonio-New Braunfels, TX Metro Area (MSA code 41700).

What is the population of ZIP code 78231?

The 2020 Census population of 78231 was 8,993 residents.

What is the median income in ZIP code 78231?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 78231 is about $71,875, with around 18% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.